Which of the following categories of organisms is NOT known to produce viable polyploids?

Which of the following categories of organisms is NOT known to produce viable polyploids?
 
  a. amphibians
  b. fish
  c. mammals
  d. fish
  e. reptiles

Question 2

Which of the following is NOT an example of a prezygotic isolating mechanism?
 
  a. An iris blooms at a different time of the year than a daffodil.
  b. A peacock puts on a different mating display than a sparrow.
  c. A snail with a shell coiling in one direction cannot mate with a snail whose shell curls the
  other way.
  d. A zebroid is sterile.
  e. One type of roundworm would reject the sperm from another species of roundworm.